PE is a crystalline raw material with very little hygroscopicity, no more than 0.01%, so there is no need for drying before processing. PE molecular chains have good flexibility, small forces between bonds, low melt viscosity, and excellent fluidity. Therefore, thin-walled long-flow products can be formed without too high pressure during molding. The shrinkage range …
The working conditions of plastic molds are different from those of cold stamping dies. They generally have to work at 150 degrees Celsius to 200 degrees Celsius. In addition to being subject to a certain pressure, they also have to withstand the influence of temperature. According to the different usage conditions and processing methods of …
Pre-molding action selection Depending on whether the injection seat retreats before and after pre-plastic feeding, that is, whether the nozzle leaves the mold, the injection molding machine generally has three options: Fixed feeding: the nozzle is always attached to the mold before and after pre-molding, and the injection seat does not move. Front feeding: The …
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​ When the mold temperature is not high, resins whose material fluidity deteriorates significantly, such as polycarbonate PC, polyphenylene ether PPO, polyethylene terephthalate, commonly known as polyester resin PETP, etc., require the mold temperature to be heated to 80 degree or above (use a mold temperature regulator). ​​
Plastic gear parts injection molding process and material analysis. Plastic gears are developing toward larger sizes, more complex geometries, and higher strength, with high-performance resins and long-glass fiber-filled composites playing an important role. Plastic gears have experienced a change from new materials to important industrial materials in the past 50 years. Today they have penetrated …
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Not enough (lack of glue) Process problems: plasticizing temperature is too low, nozzle temperature is too low, injection time is too short, injection speed is too slow, mold temperature is too low. Mold problems: the runner is too small, the gate is too small, the gate position is unreasonable, the exhaust is poor, and there …
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Solutions to bubbles appearing during injection molding Causes and solutions of bubbles When the wall thickness of the product is large, the outer surface cools faster than the central part. Therefore, as the cooling proceeds, the plastic resin in the central part shrinks and expands toward the surface, causing insufficient filling of the central part. …
How To Solve These Four Common Problems Encountered In Injection Molding Read More »
Two color mold design and injection should pay attention to matters include:
Plastic product structure design Key points of plastic product structure design Holes that are parallel to the opening direction of the mold are usually formed with a core (can be inlaid or extended) or by punching or inserting. Holes that are not parallel to the opening direction of the mold are usually made with rows …
What issues need to be paid attention to when producing PC polycarbonate products? PC has excellent performance, high transparency, good impact toughness, creep resistance, and wide operating temperature range. Process characteristics of PC: The melt viscosity is less sensitive to shear rate, but more sensitive to temperature, has no obvious melting point, the melt viscosity …
What issues need to be paid attention to when producing PC polycarbonate products? Read More »
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